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Lecture 10

# Lecture 10 - The Pennsylvania State University Department...

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The Pennsylvania State University Department of Civil and Environmental Engineering Lecture 10 – Horizontal Alignment (Part 2) CE 321: Highway Engineering Fall 2007

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Horizontal Sight Distance
Horizontal Sight Distance

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Stopping Sight Distance Considerations for Horizontal Curves Source: Figure 3.14 from MKW
Stopping Sight Distance for Horizontal Curves s v R SSD = 180 π R v = radius to vehicle’s traveled path (radius to the middle of the innermost lane) s = the angle subtended by an arc equal to the SSD distance v R SSD s π ) ( 180 =

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Stopping Sight Distance for Horizontal Curves M s = R v 1 - cos 90 (SSD) π R v SSD = π R v 90 cos -1 R v - M s R v R v = radius to vehicle’s traveled path (radius to the middle of the innermost lane) SSD = stopping sight distance (ft) M s = middle ordinate distance (ft)

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Example Problem 1 Given a design speed = 60 mi/hr SSD = 570 ft Radius = 2300 ft at centerline Determine the minimum setback for an obstruction from the edge of the pavement
Radius at the Centerline of the Travel Lane R = 2300 - (12/2) = 2294 ft Example 1 (con’t)

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Lecture 10 - The Pennsylvania State University Department...

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